Fig. 4.

Sedimentary composition and preferences of the lithodid crab P. birsteini along the western Antarctic Peninsula. (A) Observed and expected frequencies of P. birsteini on different sedimentary categories on the slope (1,100–1,500 m; n = 173). Expected values were calculated assuming the crabs showed no preferences for sedimentary categories. (B) Sedimentary composition on the continental shelf (400–600 m) and slope (1,100–1,500 m). Frequency data were converted to percentages for ease of comparison (n = 3,000 for the shelf; n = 6,000 for the slope).